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<a name="1" href="#1">1</a>   <em class="jxr_javadoccomment">/**</em>
<a name="2" href="#2">2</a>   <em class="jxr_javadoccomment"> * Copyright (c) 2009 Cerner Corporation.</em>
<a name="3" href="#3">3</a>   <em class="jxr_javadoccomment"> * All rights reserved. This program and the accompanying materials</em>
<a name="4" href="#4">4</a>   <em class="jxr_javadoccomment"> * are made available under the terms of the Eclipse Public License v1.0</em>
<a name="5" href="#5">5</a>   <em class="jxr_javadoccomment"> * which accompanies this distribution, and is available at</em>
<a name="6" href="#6">6</a>   <em class="jxr_javadoccomment"> * <a href="http://www.eclipse.org/legal/epl-v10.html" target="alexandria_uri">http://www.eclipse.org/legal/epl-v10.html</a></em>
<a name="7" href="#7">7</a>   <em class="jxr_javadoccomment"> *</em>
<a name="8" href="#8">8</a>   <em class="jxr_javadoccomment"> * Contributors:</em>
<a name="9" href="#9">9</a>   <em class="jxr_javadoccomment"> *    Cerner Corporation - initial API and implementation</em>
<a name="10" href="#10">10</a>  <em class="jxr_javadoccomment"> */</em>
<a name="11" href="#11">11</a>  <strong class="jxr_keyword">package</strong> com.cerner.system.<strong class="jxr_keyword">rest</strong>.resource.organizer;
<a name="12" href="#12">12</a>  
<a name="13" href="#13">13</a>  <strong class="jxr_keyword">import</strong> java.util.HashSet;
<a name="14" href="#14">14</a>  <strong class="jxr_keyword">import</strong> java.util.Set;
<a name="15" href="#15">15</a>  
<a name="16" href="#16">16</a>  <strong class="jxr_keyword">import</strong> com.cerner.system.<strong class="jxr_keyword">rest</strong>.internal.arguments.NotNulls;
<a name="17" href="#17">17</a>  <strong class="jxr_keyword">import</strong> com.cerner.system.<strong class="jxr_keyword">rest</strong>.resource.organizer.spi.AbstractResourceController;
<a name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> com.cerner.system.<strong class="jxr_keyword">rest</strong>.resource.organizer.spi.NotThreadSafe;
<a name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> com.cerner.system.<strong class="jxr_keyword">rest</strong>.resource.organizer.spi.ResourceKey;
<a name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> com.cerner.system.<strong class="jxr_keyword">rest</strong>.resource.organizer.spi.ResourceRef;
<a name="21" href="#21">21</a>  
<a name="22" href="#22">22</a>  <em class="jxr_javadoccomment">/**</em>
<a name="23" href="#23">23</a>  <em class="jxr_javadoccomment"> * Implementation of a {@link ResourceController} that uses a map data structure</em>
<a name="24" href="#24">24</a>  <em class="jxr_javadoccomment"> * to store resources in a hierarchy.</em>
<a name="25" href="#25">25</a>  <em class="jxr_javadoccomment"> * </em>
<a name="26" href="#26">26</a>  <em class="jxr_javadoccomment"> * @author Alex Horn</em>
<a name="27" href="#27">27</a>  <em class="jxr_javadoccomment"> */</em>
<a name="28" href="#28">28</a>  @NotThreadSafe
<a name="29" href="#29">29</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> MapResourceController&lt;E&gt; <strong class="jxr_keyword">extends</strong> AbstractResourceController&lt;E&gt; {
<a name="30" href="#30">30</a>  
<a name="31" href="#31">31</a>    <em class="jxr_javadoccomment">/**</em>
<a name="32" href="#32">32</a>  <em class="jxr_javadoccomment">   * Immutable value object that uniquely identifies the resource for which this</em>
<a name="33" href="#33">33</a>  <em class="jxr_javadoccomment">   * controller is responsible.</em>
<a name="34" href="#34">34</a>  <em class="jxr_javadoccomment">   */</em>
<a name="35" href="#35">35</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../../com/cerner/system/rest/resource/organizer/spi/ResourceKey.html">ResourceKey</a> key;
<a name="36" href="#36">36</a>  
<a name="37" href="#37">37</a>    <em class="jxr_javadoccomment">/**</em>
<a name="38" href="#38">38</a>  <em class="jxr_javadoccomment">   * Internal API that provides read and write access to the underlying map data</em>
<a name="39" href="#39">39</a>  <em class="jxr_javadoccomment">   * structure.</em>
<a name="40" href="#40">40</a>  <em class="jxr_javadoccomment">   */</em>
<a name="41" href="#41">41</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> MapResourceOrganizer&lt;E&gt; organizer;
<a name="42" href="#42">42</a>  
<a name="43" href="#43">43</a>    <em class="jxr_javadoccomment">/**</em>
<a name="44" href="#44">44</a>  <em class="jxr_javadoccomment">   * Instantiate a {@link MapResourceController} through which consumers can</em>
<a name="45" href="#45">45</a>  <em class="jxr_javadoccomment">   * navigate, access and modify the representation of a resource in a</em>
<a name="46" href="#46">46</a>  <em class="jxr_javadoccomment">   * hierarchical tree structure.</em>
<a name="47" href="#47">47</a>  <em class="jxr_javadoccomment">   * </em>
<a name="48" href="#48">48</a>  <em class="jxr_javadoccomment">   * @param key uniform identifier for the resource that this controller</em>
<a name="49" href="#49">49</a>  <em class="jxr_javadoccomment">   *          represents</em>
<a name="50" href="#50">50</a>  <em class="jxr_javadoccomment">   * @param organizer internal API through which the underlying data structure</em>
<a name="51" href="#51">51</a>  <em class="jxr_javadoccomment">   *          is accessed and modified</em>
<a name="52" href="#52">52</a>  <em class="jxr_javadoccomment">   */</em>
<a name="53" href="#53">53</a>    <strong class="jxr_keyword">protected</strong> <a href="../../../../../../com/cerner/system/rest/resource/organizer/MapResourceController.html">MapResourceController</a>(<strong class="jxr_keyword">final</strong> <a href="../../../../../../com/cerner/system/rest/resource/organizer/spi/ResourceKey.html">ResourceKey</a> key,
<a name="54" href="#54">54</a>        <strong class="jxr_keyword">final</strong> MapResourceOrganizer&lt;E&gt; organizer) {
<a name="55" href="#55">55</a>      <strong class="jxr_keyword">this</strong>.key = key;
<a name="56" href="#56">56</a>      <strong class="jxr_keyword">this</strong>.organizer = organizer;
<a name="57" href="#57">57</a>    }
<a name="58" href="#58">58</a>  
<a name="59" href="#59">59</a>    <strong class="jxr_keyword">public</strong> java.net.URI uri() {
<a name="60" href="#60">60</a>      <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.key.uri();
<a name="61" href="#61">61</a>    }
<a name="62" href="#62">62</a>  
<a name="63" href="#63">63</a>    <strong class="jxr_keyword">public</strong> MapResourceController&lt;E&gt; parent() {
<a name="64" href="#64">64</a>      <strong class="jxr_keyword">final</strong> <a href="../../../../../../com/cerner/system/rest/resource/organizer/spi/ResourceKey.html">ResourceKey</a> parentKey = <strong class="jxr_keyword">this</strong>.key.parent();
<a name="65" href="#65">65</a>      <strong class="jxr_keyword">if</strong> (parentKey == <strong class="jxr_keyword">null</strong>) {
<a name="66" href="#66">66</a>        <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a name="67" href="#67">67</a>      } <strong class="jxr_keyword">else</strong> {
<a name="68" href="#68">68</a>        <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> MapResourceController&lt;E&gt;(parentKey, <strong class="jxr_keyword">this</strong>.organizer);
<a name="69" href="#69">69</a>      }
<a name="70" href="#70">70</a>    }
<a name="71" href="#71">71</a>  
<a name="72" href="#72">72</a>    <strong class="jxr_keyword">public</strong> E get() {
<a name="73" href="#73">73</a>      <strong class="jxr_keyword">final</strong> ResourceRef&lt;E&gt; node = ref();
<a name="74" href="#74">74</a>      <strong class="jxr_keyword">if</strong> (node != <strong class="jxr_keyword">null</strong>) {
<a name="75" href="#75">75</a>        <strong class="jxr_keyword">return</strong> node.get();
<a name="76" href="#76">76</a>      } <strong class="jxr_keyword">else</strong> {
<a name="77" href="#77">77</a>        <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a name="78" href="#78">78</a>      }
<a name="79" href="#79">79</a>    }
<a name="80" href="#80">80</a>  
<a name="81" href="#81">81</a>    <em class="jxr_comment">/*</em>
<a name="82" href="#82">82</a>  <em class="jxr_comment">   * MapResourceController does not maintain state by itself. It uses a mutable</em>
<a name="83" href="#83">83</a>  <em class="jxr_comment">   * MapResourceRef object to record the state of a node in the tree data</em>
<a name="84" href="#84">84</a>  <em class="jxr_comment">   * structure.</em>
<a name="85" href="#85">85</a>  <em class="jxr_comment">   */</em>
<a name="86" href="#86">86</a>    <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> put(<strong class="jxr_keyword">final</strong> E representation) {
<a name="87" href="#87">87</a>      NotNulls.names(<span class="jxr_string">"representation"</span>).values(representation);
<a name="88" href="#88">88</a>  
<a name="89" href="#89">89</a>      buildTree();
<a name="90" href="#90">90</a>      <strong class="jxr_keyword">return</strong> ref().set(representation);
<a name="91" href="#91">91</a>    }
<a name="92" href="#92">92</a>  
<a name="93" href="#93">93</a>    <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> delete() {
<a name="94" href="#94">94</a>      <strong class="jxr_keyword">final</strong> MapResourceRef&lt;E&gt; node = ref();
<a name="95" href="#95">95</a>      <strong class="jxr_keyword">if</strong> (node != <strong class="jxr_keyword">null</strong>) {
<a name="96" href="#96">96</a>        <strong class="jxr_keyword">this</strong>.organizer.removeAll(node.descendants());
<a name="97" href="#97">97</a>  
<a name="98" href="#98">98</a>        <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="99" href="#99">99</a>      } <strong class="jxr_keyword">else</strong> {
<a name="100" href="#100">100</a>       <strong class="jxr_keyword">return</strong> false;
<a name="101" href="#101">101</a>     }
<a name="102" href="#102">102</a>   }
<a name="103" href="#103">103</a> 
<a name="104" href="#104">104</a>   <em class="jxr_javadoccomment">/**</em>
<a name="105" href="#105">105</a> <em class="jxr_javadoccomment">   * Internal API that creates or updates the ancestors of the resource node</em>
<a name="106" href="#106">106</a> <em class="jxr_javadoccomment">   * that corresponds to the {@link ResourceKey} which has been injected as part</em>
<a name="107" href="#107">107</a> <em class="jxr_javadoccomment">   * of the constructor. Once the method has executed the underlying map data</em>
<a name="108" href="#108">108</a> <em class="jxr_javadoccomment">   * structure must maintain enough information so that {@link #delete()}</em>
<a name="109" href="#109">109</a> <em class="jxr_javadoccomment">   * operation can meet the specification.</em>
<a name="110" href="#110">110</a> <em class="jxr_javadoccomment">   * </em>
<a name="111" href="#111">111</a> <em class="jxr_javadoccomment">   * @see MapResourceController#delete()</em>
<a name="112" href="#112">112</a> <em class="jxr_javadoccomment">   */</em>
<a name="113" href="#113">113</a>   <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> buildTree() {
<a name="114" href="#114">114</a> 
<a name="115" href="#115">115</a>     <em class="jxr_comment">/*<em class="jxr_comment"> loop variants */</em></em>
<a name="116" href="#116">116</a>     <strong class="jxr_keyword">final</strong> Set&lt;ResourceKey&gt; descendents = <strong class="jxr_keyword">new</strong> HashSet&lt;ResourceKey&gt;(
<a name="117" href="#117">117</a>         <strong class="jxr_keyword">this</strong>.key.level());
<a name="118" href="#118">118</a>     MapResourceController&lt;E&gt; ancestor;
<a name="119" href="#119">119</a>     MapResourceRef&lt;E&gt; ancestorRef;
<a name="120" href="#120">120</a> 
<a name="121" href="#121">121</a>     <strong class="jxr_keyword">for</strong> (ancestor = <strong class="jxr_keyword">this</strong>; ancestor != <strong class="jxr_keyword">null</strong>; ancestor = ancestor.parent()) {
<a name="122" href="#122">122</a>       descendents.add(ancestor.key);
<a name="123" href="#123">123</a> 
<a name="124" href="#124">124</a>       ancestorRef = ancestor.ref();
<a name="125" href="#125">125</a>       <strong class="jxr_keyword">if</strong> (ancestorRef == <strong class="jxr_keyword">null</strong>) {
<a name="126" href="#126">126</a>         ancestorRef = <strong class="jxr_keyword">new</strong> MapResourceRef&lt;E&gt;();
<a name="127" href="#127">127</a>         <strong class="jxr_keyword">this</strong>.organizer.put(ancestor.key, ancestorRef);
<a name="128" href="#128">128</a>       }
<a name="129" href="#129">129</a> 
<a name="130" href="#130">130</a>       ancestorRef.update(descendents);
<a name="131" href="#131">131</a>     }
<a name="132" href="#132">132</a>   }
<a name="133" href="#133">133</a> 
<a name="134" href="#134">134</a>   <em class="jxr_javadoccomment">/**</em>
<a name="135" href="#135">135</a> <em class="jxr_javadoccomment">   * Internal API to find the {@code MapResourceRef} that is associated with</em>
<a name="136" href="#136">136</a> <em class="jxr_javadoccomment">   * this resource controller.</em>
<a name="137" href="#137">137</a> <em class="jxr_javadoccomment">   * </em>
<a name="138" href="#138">138</a> <em class="jxr_javadoccomment">   * @return resource reference stored with the key of this controller or</em>
<a name="139" href="#139">139</a> <em class="jxr_javadoccomment">   *         {@code null} if none could be found</em>
<a name="140" href="#140">140</a> <em class="jxr_javadoccomment">   */</em>
<a name="141" href="#141">141</a>   <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">final</strong> MapResourceRef&lt;E&gt; ref() {
<a name="142" href="#142">142</a>     <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.organizer.get(<strong class="jxr_keyword">this</strong>.key);
<a name="143" href="#143">143</a>   }
<a name="144" href="#144">144</a> 
<a name="145" href="#145">145</a> }
</pre>
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